圆圈覆盖跟随用户位置

Question

如何让我的自定义圆圈叠加层作为子视图实时跟随当前用户位置？我已经设法显示我的圆圈覆盖并到达用户位置的中心，但是当用户移动（gps）时，覆盖保持静止并且不跟随用户。我该如何解决？提前谢谢你..

- (void)viewDidLoad {
[super viewDidLoad];



[self.mapView setRegion:MKCoordinateRegionMake(self.location.coordinate, MKCoordinateSpanMake(0.02, 0.02))];
[self configureOverlay];

[[self locationManager] startUpdatingLocation];

}

在configureOverlay中：

        CircleOverlay *overlay = [[CircleOverlay alloc] initWithCoordinate:self.location.coordinate radius:self.radius];

    [self.mapView addOverlay:overlay];

    GeoQueryAnnotation *annotation = [[GeoQueryAnnotation alloc] initWithCoordinate:self.location.coordinate radius:self.radius];

    [self.mapView addAnnotation:annotation];

我也尝试过使用：

 CLLocation *location = _locationManager.location;

    CLLocationCoordinate2D coordinate = [location coordinate];

并用 self.location.coordinate 替换坐标

任何建议将不胜感激。谢谢您

Answer 1

告诉你的班级你将要实现 CLLocationManagerDelegate

@interface YourClass () <CLLocationManagerDelegate>

然后添加以下方法：

    #pragma mark CLLocationManagerDelegate Methods
    - (void)locationManager:(CLLocationManager *)manager
        didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
//You can change the overlay coordinates here. Even with an animation if you want.

    }

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSString *errorType = (error.code == kCLErrorDenied) ? @"Access Denied" : @"Unknown Error";
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error getting Location"message:errorType delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil];
    [alert show];
}

locationManager:didUpdateToLocation... 方法将在每次位置管理器检测到用户位置发生变化时触发。

干杯。

编辑 我忘记了一件非常重要的事情。在您的 viewDidLoad 方法中添加您的类作为委托：

self.locationmanager.delegate = self;